This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Why is the oldest continental crust (4.4 billion years) so much older than the oldest oceanic crust ... (Read 90 times)

Lobcity

  • Hero Member
  • *****
  • Posts: 524
on: Jul 16, 2018
Why is the oldest continental crust (4.4 billion years) so much older than the oldest oceanic crust (180 million years)?
 
  What will be an ideal response?

Question 2

How can we estimate the abundances of chemical elements in the early solar system?
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

alvinum

  • Sr. Member
  • ****
  • Posts: 317
Reply #1 on: Jul 16, 2018
Answer to Question 1

All of the oceanic crust older than 180 million years has been destroyed by subduction.

Answer to Question 2

We can use the composition of meteorites that have not been modified by accretion into planetesimals.


Lobcity

  • Member
  • Posts: 524
Reply 2 on: Jul 16, 2018
YES! Correct, THANKS for helping me on my review

steff9894

  • Member
  • Posts: 337
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

« previous next »
 

Did you know?

Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Did you know?

In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

Did you know?

It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

Did you know?

Cutaneous mucormycosis is a rare fungal infection that has been fatal in at least 29% of cases, and in as many as 83% of cases, depending on the patient's health prior to infection. It has occurred often after natural disasters such as tornados, and early treatment is essential.

Continental Drift—An Early Idea Continental Drift—An Early Idea
H. erectus migrated out of Africa beginning about 1.8 million years ago and is first known from Geor H. erectus migrated out of Africa beginning about 1.8 million years ago and is first known from Geor
Abundant cave art after about 30,000 years ago is evidence of the importance of symbolic behavior fo Abundant cave art after about 30,000 years ago is evidence of the importance of symbolic behavior fo
Pharmacology of the older adult can be challenging due to physiological changes that occur with ... Pharmacology of the older adult can be challenging due to physiological changes that occur with ...
Continental Drift: An Idea Before Its Time Continental Drift: An Idea Before Its Time
Earth 65 Million Years Ago Earth 65 Million Years Ago
Video: How eudicots (true dicots) differ from monocots Animation

For a complete list of videos, visit our video library